Aging induces muscle-specific impairment of endothelium-dependent dilation in skeletal muscle feed arteries

Departments of Veterinary Biomedical Sciences and Physiology and Dalton Cardiovascular Research Center, University of Missouri, Columbia, Missouri 65211 We tested the hypothesis that aging decreases endothelium-dependent vasodilation in feed arteries perfusing rat skeletal muscle. In addition, we te...

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Published inJournal of applied physiology (1985) Vol. 93; no. 5; pp. 1685 - 1690
Main Authors Woodman, Christopher R, Price, Elmer M, Laughlin, M. Harold
Format Journal Article
LanguageEnglish
Published Bethesda, MD Am Physiological Soc 01.11.2002
American Physiological Society
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Summary:Departments of Veterinary Biomedical Sciences and Physiology and Dalton Cardiovascular Research Center, University of Missouri, Columbia, Missouri 65211 We tested the hypothesis that aging decreases endothelium-dependent vasodilation in feed arteries perfusing rat skeletal muscle. In addition, we tested the hypothesis that attenuated vasodilator responses are associated with decreased endothelial nitric oxide synthase (eNOS) and superoxide dismutase-1 (SOD-1) expression. Soleus feed arteries (SFA) and gastrocnemius feed arteries (GFA) were isolated from young (4 mo) and old (24 mo) male Fischer 344   rats. Feed arteries from the right hindlimb were cannulated with two glass micropipettes for examination of endothelium-dependent [acetylcholine (ACh)] and endothelium-independent [adenosine (Ado) or sodium nitroprusside (SNP)] vasodilator function. Feed arteries from the left hindlimb were frozen and used to assess eNOS and SOD-1 protein and mRNA expression. In SFA, endothelium-dependent dilation to ACh was reduced in old rats (0.9 ± 0.04 vs. 0.8 ±   0.03), whereas dilator responses to Ado and SNP were similar in SFA of young and old rats. In GFA, vasodilator responses to ACh, Ado, and SNP were not altered by age. eNOS and SOD-1 protein expression declined with age in SFA ( 71 and 54%, respectively) but not in GFA. eNOS and SOD-1 mRNA expression were not altered by age in SFA or GFA. Collectively, these data indicate aging induces muscle-specific impairment of endothelium-dependent vascular function in SFA. endothelial nitric oxide synthase; superoxide dismutase; nitric oxide; acetylcholine; sodium nitroprusside
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ISSN:8750-7587
1522-1601
DOI:10.1152/japplphysiol.00461.2002